Import wiredtiger: fc0e7abe82595e579573d42448632f7b36a2d154 from branch mongodb-3.4

ref: 5bc03723a7..fc0e7abe82
for: 3.3.15

WT-2864       Reconfiguring the checkpoint server can lead to hangs
WT-2874       Change test_compact01 to avoid eviction
WT-2918       The dist scripts create C files s_whitespace complains about
WT-2919       Don't mask error returns from style checking scripts
WT-2921       Reduce the WT_SESSION hazard_size when possible
WT-2923       heap-use-after-free on address in compaction
WT-2924       Ensure we are doing eviction when threads are waiting for it
WT-2925       WT_THREAD_PANIC_FAIL is a WT_THREAD structure flag
WT-2926       WT_CONNECTION.reconfigure can attempt unlock of not-locked lock
WT-2928       Eviction failing to switch queues can lead to starvation

33 files changed, 342 insertions, 194 deletions

diff --git a/src/third_party/wiredtiger/dist/s_all b/src/third_party/wiredtiger/dist/s_all
index 33b8f6a76ba..31abab28910 100755
--- a/src/third_party/wiredtiger/dist/s_all
+++ b/src/third_party/wiredtiger/dist/s_all
@@ -56,7 +56,7 @@ errchk()
 
 	# Some tests shouldn't return an error, we exclude them here.
 	case "$1" in
-	*s_export*)
+	*s_export|*s_tags)
 		break;;
 	*)
 		errfound=1;;
@@ -124,3 +124,4 @@ echo 'dist/s_all run finished'
 if test $errmode -ne 0; then
 	exit $errfound;
 fi
+exit 0
diff --git a/src/third_party/wiredtiger/dist/s_c_test_create b/src/third_party/wiredtiger/dist/s_c_test_create
index 616570dca2e..f4f9eb3ac1f 100755
--- a/src/third_party/wiredtiger/dist/s_c_test_create
+++ b/src/third_party/wiredtiger/dist/s_c_test_create
@@ -12,7 +12,7 @@
 # script in the main C suite directory.
 #
 tmp=__a
-trap 'rm -f $tmp; exit 0' 0 1 2 3 13 15
+trap 'rm -f $tmp' 0 1 2 3 13 15
 
 if [ "x$1" = "x" ]; then
 	echo "Usage: $0 test_name"
diff --git a/src/third_party/wiredtiger/dist/s_copyright b/src/third_party/wiredtiger/dist/s_copyright
index cfada71a839..9ff6c20492e 100755
--- a/src/third_party/wiredtiger/dist/s_copyright
+++ b/src/third_party/wiredtiger/dist/s_copyright
@@ -53,7 +53,7 @@ if [ $# -ne 0 ]; then
 	exit 0
 fi
 
-trap 'rm -f $c1 $c2 $c3 $c4; exit 0' 0 1 2 3 13 15
+trap 'rm -f $c1 $c2 $c3 $c4' 0 1 2 3 13 15
 
 year=`date +%Y`
 
@@ -141,3 +141,5 @@ special_copyright LICENSE 1 "$string1"
 special_copyright src/docs/build-javadoc.sh 1 "$string2"
 special_copyright src/docs/style/footer.html 2 "$string2"
 special_copyright src/utilities/util_cpyright.c 1 "$string3"
+
+exit 0
diff --git a/src/third_party/wiredtiger/dist/s_define b/src/third_party/wiredtiger/dist/s_define
index 050101e8510..d5bdee7c45f 100755
--- a/src/third_party/wiredtiger/dist/s_define
+++ b/src/third_party/wiredtiger/dist/s_define
@@ -2,7 +2,7 @@
 
 # Complain about unused #defines.
 t=__wt.$$
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t' 0 1 2 3 13 15
 
 # List of source files to search.
 l=`sed -e '/^[a-z]/!d' -e 's/[	 ].*$//' -e 's,^,../,' filelist`
diff --git a/src/third_party/wiredtiger/dist/s_docs b/src/third_party/wiredtiger/dist/s_docs
index 08602989fe8..e2b1d2aed11 100755
--- a/src/third_party/wiredtiger/dist/s_docs
+++ b/src/third_party/wiredtiger/dist/s_docs
@@ -1,7 +1,7 @@
 #! /bin/sh
 
 t=__wt.$$
-trap 'rm -f $t /tmp/__doxy; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t /tmp/__doxy' 0 1 2 3 13 15
 
 # Skip this when building release packages: docs are built separately
 test -n "$WT_RELEASE_BUILD" && exit 0
diff --git a/src/third_party/wiredtiger/dist/s_export b/src/third_party/wiredtiger/dist/s_export
index 94242e0118d..dc69238b270 100755
--- a/src/third_party/wiredtiger/dist/s_export
+++ b/src/third_party/wiredtiger/dist/s_export
@@ -2,8 +2,8 @@
 
 # Check for illegal external symbols.
 #
-t=__a.c
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+t=__wt.$$
+trap 'rm -f $t' 0 1 2 3 13 15
 
 case `uname` in
 Darwin)
@@ -40,8 +40,10 @@ check()
 }
 
 # This check would normally be done after the library is built, but this way
-# we don't forget about a symbol during development.   Check the previously
-# built library, if it exists.
+# we don't forget about a symbol during development. We usually build in the
+# top-level or build_posix directories, check the previously built library,
+# if it exists. And, allow this script to be run from the top-level directory
+# as well as locally.
 for d in .libs build_posix/.libs; do
 	f="$d/libwiredtiger.a"
 	test -f $f && check $f
diff --git a/src/third_party/wiredtiger/dist/s_funcs b/src/third_party/wiredtiger/dist/s_funcs
index 8695c8d4fa7..70ddc7cbd68 100755
--- a/src/third_party/wiredtiger/dist/s_funcs
+++ b/src/third_party/wiredtiger/dist/s_funcs
@@ -2,7 +2,7 @@
 
 # Complain about unused functions
 t=__wt.$$
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t' 0 1 2 3 13 15
 
 # List of files to search.
 l=`sed -e '/^[a-z]/!d' -e 's/[	 ].*$//' -e 's,^,../,' filelist`
diff --git a/src/third_party/wiredtiger/dist/s_label b/src/third_party/wiredtiger/dist/s_label
index b56ecc6fc78..c7b63d9d5b3 100755
--- a/src/third_party/wiredtiger/dist/s_label
+++ b/src/third_party/wiredtiger/dist/s_label
@@ -2,7 +2,7 @@
 
 # Check WiredTiger error/return macros.
 t=__wt.$$
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t' 0 1 2 3 13 15
 
 cd ..
 
@@ -79,3 +79,5 @@ for f in `find bench examples ext src test -name '*.[ci]'`; do
 		sed -e "s,^,$f:," -e 's/$/ [return skips API_END call]/'
 
 done
+
+exit 0
diff --git a/src/third_party/wiredtiger/dist/s_lang b/src/third_party/wiredtiger/dist/s_lang
index 0f0519f87e4..cd229b4ea29 100755
--- a/src/third_party/wiredtiger/dist/s_lang
+++ b/src/third_party/wiredtiger/dist/s_lang
@@ -2,7 +2,7 @@
 
 # Check lang directories for potential name conflicts
 t=__wt.$$
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t' 0 1 2 3 13 15
 
 cd ../lang
 
@@ -21,5 +21,8 @@ for d in *; do
 		echo "$l: potential SWIG naming conflict"
 		echo "=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-="
 		cat $t
+		exit 1
 	}
 done
+
+exit 0
diff --git a/src/third_party/wiredtiger/dist/s_longlines b/src/third_party/wiredtiger/dist/s_longlines
index 43e350022dd..bdb9811b4bd 100755
--- a/src/third_party/wiredtiger/dist/s_longlines
+++ b/src/third_party/wiredtiger/dist/s_longlines
@@ -2,7 +2,7 @@
 
 # Check for long lines
 t=__wt.$$
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t' 0 1 2 3 13 15
 
 l=`(cd .. &&
     find bench/wtperf examples ext src test -name '*.[chisy]' &&
@@ -20,3 +20,5 @@ for f in $l ; do
 	expand -t8 < ../$f | awk -- \
 	    "{if(length(\$0) > 80) printf(\"%s:%d\\n\", \"$f\", NR)}"
 done
+
+exit 0
diff --git a/src/third_party/wiredtiger/dist/s_prototypes b/src/third_party/wiredtiger/dist/s_prototypes
index 5633c3b5140..4c07b9aa160 100755
--- a/src/third_party/wiredtiger/dist/s_prototypes
+++ b/src/third_party/wiredtiger/dist/s_prototypes
@@ -2,7 +2,7 @@
 
 # Build a list of internal function and variable prototypes.
 t=__wt.$$
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t' 0 1 2 3 13 15
 
 # proto --
 #	extract public functions.
@@ -83,3 +83,5 @@ l=`sed \
     -e '/os_win/d' \
     -e 's/[	 ].*$//' filelist`
 externs
+
+exit 0
diff --git a/src/third_party/wiredtiger/dist/s_python b/src/third_party/wiredtiger/dist/s_python
index ce955328288..b8aa5848637 100755
--- a/src/third_party/wiredtiger/dist/s_python
+++ b/src/third_party/wiredtiger/dist/s_python
@@ -2,7 +2,7 @@
 
 # Python style checks.
 t=__wt.$$
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t' 0 1 2 3 13 15
 
 cd ..
 
@@ -25,3 +25,5 @@ test -s $t && {
 	echo 'trailing semi-colons in selected Python code:'
 	cat $t
 }
+
+exit 0
diff --git a/src/third_party/wiredtiger/dist/s_readme b/src/third_party/wiredtiger/dist/s_readme
index be809a6455c..316e60773e0 100755
--- a/src/third_party/wiredtiger/dist/s_readme
+++ b/src/third_party/wiredtiger/dist/s_readme
@@ -1,7 +1,7 @@
 #! /bin/sh
 
 t=__wt.$$
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t' 0 1 2 3 13 15
 f=../README
 
 . ../RELEASE_INFO
@@ -60,3 +60,5 @@ END_TEXT
 
 cmp $t $f > /dev/null 2>&1 ||
     (echo "Building $f" && rm -f $f && cp $t $f)
+
+exit 0
diff --git a/src/third_party/wiredtiger/dist/s_stat b/src/third_party/wiredtiger/dist/s_stat
index 0638a7f3337..935c7e1fb43 100755
--- a/src/third_party/wiredtiger/dist/s_stat
+++ b/src/third_party/wiredtiger/dist/s_stat
@@ -2,7 +2,7 @@
 
 # Complain about unused statistics fields.
 t=__wt.$$
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t' 0 1 2 3 13 15
 
 # List of files to search: skip stat.c, it lists all of the fields by
 # definition.
diff --git a/src/third_party/wiredtiger/dist/s_string b/src/third_party/wiredtiger/dist/s_string
index 32aa7528979..b7b0a4bbdba 100755
--- a/src/third_party/wiredtiger/dist/s_string
+++ b/src/third_party/wiredtiger/dist/s_string
@@ -3,7 +3,7 @@
 # Check spelling in comments and quoted strings from the source files.
 
 t=__wt.$$
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t' 0 1 2 3 13 15
 
 # Insulate against locale-specific sort order
 LC_ALL=C
diff --git a/src/third_party/wiredtiger/dist/s_style b/src/third_party/wiredtiger/dist/s_style
index 47f18ef1f18..3860a23b991 100755
--- a/src/third_party/wiredtiger/dist/s_style
+++ b/src/third_party/wiredtiger/dist/s_style
@@ -2,7 +2,7 @@
 
 # General style correction and cleanup.
 t=__wt.$$
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t' 0 1 2 3 13 15
 
 # Parallelize if possible.
 xp=""
@@ -183,3 +183,5 @@ else
 
 	cmp $t $f > /dev/null 2>&1 || (echo "modifying $f" && cp $t $f)
 fi
+
+exit 0
diff --git a/src/third_party/wiredtiger/dist/s_tags b/src/third_party/wiredtiger/dist/s_tags
index faed132d05b..edb1567992c 100755
--- a/src/third_party/wiredtiger/dist/s_tags
+++ b/src/third_party/wiredtiger/dist/s_tags
@@ -1,41 +1,43 @@
 #! /bin/sh
 
-# Build tags file.
-#
-t=__a.c
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+# Build tags files.
+trap 'rm -f tags' 0 1 2 3 13 15
 
 # Skip this when building release packages
 test -n "$WT_RELEASE_BUILD" && exit 0
 
+# We have to be in the dist directory to run.
+test -f s_tags || {
+	echo "s_tags requires dist be the current working directory"
+	exit 1
+}
+
 # We require ctags which may not be installed.
 type ctags > /dev/null 2>&1 || {
-	echo 'skipped: ctags not found' > $t
+	echo 'skipped: ctags not found'
 	exit 0
 }
 
 # Test to see what flags this ctags binary supports.
-# Use the -d, -t and -w flags to ctags if available.
 flags=""
-echo "f() { int a; }" > $t
 for i in -d -t -w --language-force=C; do
-	if ctags $i $t 2>/dev/null; then
+	if ctags $i ../src/conn/api_strerror.c 2>/dev/null; then
 		flags="$i $flags"
 	fi
 done
 
-# Generate a tags file for the build directory
-(cd ../build_posix
-rm -f tags
-ctags $flags ../src/include/*.in ../src/*/*.[chi] 2>/dev/null)
+# Generate a tags file for the standard build directory.
+(cd ../build_posix &&
+rm -f tags &&
+ctags $flags ../src/include/*.in `find ../src -name '*.[chi]'` 2>/dev/null)
 
-# Put the shared tags file in the include directory, it's at the same level in
-# the tree as the other source files.
-(cd ../src/include
-rm -f tags
-ctags $flags ../include/*.in ../*/*.[chi] 2>/dev/null)
+# Generate a tags file for the src/include directory.
+(cd ../src/include &&
+rm -f tags &&
+ctags $flags ../include/*.in `find .. -name '*.[chi]'` 2>/dev/null)
 
-# Link the tags file into place if we're at the right level.
+# Link the tags file into place in the standard source directories, if we're
+# at the right level.
 link_tag()
 {
 	if test -e ../include/tags; then
@@ -46,8 +48,9 @@ link_tag()
 # Link to the tags file from standard build and source directories.
 dirs="`python -c 'import dist; dist.print_source_dirs()'` ../src/os_win"
 for i in $dirs; do
-	if expr "$i" : ".*/include" > /dev/null; then
-		continue
-	fi
+	expr "$i" : ".*/include" > /dev/null && continue
+
 	(cd $i && link_tag)
 done
+
+exit 0
diff --git a/src/third_party/wiredtiger/dist/s_typedef b/src/third_party/wiredtiger/dist/s_typedef
index b044a0e6b4b..d4bcda94e74 100755
--- a/src/third_party/wiredtiger/dist/s_typedef
+++ b/src/third_party/wiredtiger/dist/s_typedef
@@ -1,7 +1,7 @@
 #! /bin/sh
 
 t=__wt.$$
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t' 0 1 2 3 13 15
 
 # Insulate against locale-specific sort order and IFS from the user's env
 LC_ALL=C
diff --git a/src/third_party/wiredtiger/dist/s_void b/src/third_party/wiredtiger/dist/s_void
index ab2f23a5fdd..f7bfbcc7e8e 100644
--- a/src/third_party/wiredtiger/dist/s_void
+++ b/src/third_party/wiredtiger/dist/s_void
@@ -1,7 +1,7 @@
 #! /bin/sh
 
 t=__wt.$$
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t' 0 1 2 3 13 15
 
 cd ..
 
@@ -132,3 +132,5 @@ for f in `find bench ext src test -name '*.[ci]'`; do
 		cat $t
 	}
 done
+
+exit 0
diff --git a/src/third_party/wiredtiger/dist/s_whitespace b/src/third_party/wiredtiger/dist/s_whitespace
index e60d85f8cc6..0de59bc5825 100755
--- a/src/third_party/wiredtiger/dist/s_whitespace
+++ b/src/third_party/wiredtiger/dist/s_whitespace
@@ -2,7 +2,7 @@
 
 # Single space and remove trailing whitespace from source files.
 t=__wt.$$
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t' 0 1 2 3 13 15
 
 # Clear lines that only contain whitespace, compress multiple empty lines
 # into a single line, discard trailing empty lines.
@@ -30,3 +30,5 @@ find bench dist examples ext src test \
 | while read f ; do
 	whitespace $f
 done
+
+exit 0
diff --git a/src/third_party/wiredtiger/dist/s_wtstats b/src/third_party/wiredtiger/dist/s_wtstats
index 834b011110e..82eee1ab1cf 100755
--- a/src/third_party/wiredtiger/dist/s_wtstats
+++ b/src/third_party/wiredtiger/dist/s_wtstats
@@ -3,7 +3,7 @@
 # Create wtstats.template.html file
 
 t=__wt.$$
-trap 'rm -f $t; exit 0' 0 1 2 3 13 15
+trap 'rm -f $t' 0 1 2 3 13 15
 
 # We require npm which may not be installed.
 type npm > /dev/null 2>&1 || {
diff --git a/src/third_party/wiredtiger/src/btree/bt_compact.c b/src/third_party/wiredtiger/src/btree/bt_compact.c
index 7ba45f29b76..e005674762d 100644
--- a/src/third_party/wiredtiger/src/btree/bt_compact.c
+++ b/src/third_party/wiredtiger/src/btree/bt_compact.c
@@ -171,30 +171,64 @@ int
 __wt_compact_page_skip(WT_SESSION_IMPL *session, WT_REF *ref, bool *skipp)
 {
 	WT_BM *bm;
+	WT_DECL_RET;
 	size_t addr_size;
 	u_int type;
 	const uint8_t *addr;
 
-	*skipp = false;				/* Default to reading. */
-	type = 0;				/* Keep compiler quiet. */
+	/*
+	 * Skip deleted pages, rewriting them doesn't seem useful; in a better
+	 * world we'd write the parent to delete the page.
+	 */
+	if (ref->state == WT_REF_DELETED) {
+		*skipp = true;
+		return (0);
+	}
 
-	bm = S2BT(session)->bm;
+	*skipp = false;				/* Default to reading */
 
 	/*
-	 * We aren't holding a hazard pointer, so we can't look at the page
-	 * itself, all we can look at is the WT_REF information.  If there's no
-	 * address, the page isn't on disk, but we have to read internal pages
-	 * to walk the tree regardless; throw up our hands and read it.
+	 * If the page is in-memory, we want to look at it (it may have been
+	 * modified and written, and the current location is the interesting
+	 * one in terms of compaction, not the original location).
+	 *
+	 * This test could be combined with the next one, but this is a cheap
+	 * test and the next one is expensive.
 	 */
-	__wt_ref_info(ref, &addr, &addr_size, &type);
-	if (addr == NULL)
+	if (ref->state != WT_REF_DISK)
+		return (0);
+
+	/*
+	 * There's nothing to prevent the WT_REF state from changing underfoot,
+	 * which can change its address. For example, the WT_REF address might
+	 * reference an on-page cell, and page eviction can free that memory.
+	 * Lock the WT_REF so we can look at its address.
+	 */
+	if (!__wt_atomic_casv32(&ref->state, WT_REF_DISK, WT_REF_LOCKED))
 		return (0);
 
 	/*
+	 * The page is on disk, so there had better be an address; assert that
+	 * fact, test at run-time to avoid the core dump.
+	 *
 	 * Internal pages must be read to walk the tree; ask the block-manager
 	 * if it's useful to rewrite leaf pages, don't do the I/O if a rewrite
 	 * won't help.
 	 */
-	return (type == WT_CELL_ADDR_INT ? 0 :
-	    bm->compact_page_skip(bm, session, addr, addr_size, skipp));
+	__wt_ref_info(ref, &addr, &addr_size, &type);
+	WT_ASSERT(session, addr != NULL);
+	if (addr != NULL && type != WT_CELL_ADDR_INT) {
+		bm = S2BT(session)->bm;
+		ret = bm->compact_page_skip(
+		    bm, session, addr, addr_size, skipp);
+	}
+
+	/*
+	 * Reset the WT_REF state and push the change. The full-barrier isn't
+	 * necessary, but it's better to keep pages in circulation than not.
+	 */
+	ref->state = WT_REF_DISK;
+	WT_FULL_BARRIER();
+
+	return (ret);
 }
diff --git a/src/third_party/wiredtiger/src/btree/bt_walk.c b/src/third_party/wiredtiger/src/btree/bt_walk.c
index dc1cf4e7f98..fb0d2296823 100644
--- a/src/third_party/wiredtiger/src/btree/bt_walk.c
+++ b/src/third_party/wiredtiger/src/btree/bt_walk.c
@@ -472,27 +472,14 @@ restart:	/*
 				empty_internal = false;
 			} else if (LF_ISSET(WT_READ_COMPACT)) {
 				/*
-				 * Skip deleted pages, rewriting them doesn't
-				 * seem useful.
+				 * Compaction has relatively complex tests to
+				 * decide if a page can be skipped, call out
+				 * to a helper function.
 				 */
-				if (ref->state == WT_REF_DELETED)
+				WT_ERR(__wt_compact_page_skip(
+				    session, ref, &skip));
+				if (skip)
 					break;
-
-				/*
-				 * If the page is in-memory, we want to look at
-				 * it (it may have been modified and written,
-				 * and the current location is the interesting
-				 * one in terms of compaction, not the original
-				 * location).  If the page isn't in-memory, test
-				 * if the page will help with compaction, don't
-				 * read it if we don't have to.
-				 */
-				if (ref->state == WT_REF_DISK) {
-					WT_ERR(__wt_compact_page_skip(
-					    session, ref, &skip));
-					if (skip)
-						break;
-				}
 			} else {
 				/*
 				 * Try to skip deleted pages visible to us.
diff --git a/src/third_party/wiredtiger/src/conn/conn_api.c b/src/third_party/wiredtiger/src/conn/conn_api.c
index faec72a4ac0..0951fd4e58c 100644
--- a/src/third_party/wiredtiger/src/conn/conn_api.c
+++ b/src/third_party/wiredtiger/src/conn/conn_api.c
@@ -1055,13 +1055,16 @@ __conn_reconfigure(WT_CONNECTION *wt_conn, const char *config)
 	WT_DECL_RET;
 	WT_SESSION_IMPL *session;
 	const char *p;
+	bool locked;
 
 	conn = (WT_CONNECTION_IMPL *)wt_conn;
+	locked = false;
 
 	CONNECTION_API_CALL(conn, session, reconfigure, config, cfg);
 
 	/* Serialize reconfiguration. */
 	__wt_spin_lock(session, &conn->reconfig_lock);
+	locked = true;
 
 	/*
 	 * The configuration argument has been checked for validity, update the
@@ -1096,7 +1099,8 @@ __conn_reconfigure(WT_CONNECTION *wt_conn, const char *config)
 	__wt_free(session, conn->cfg);
 	conn->cfg = p;
 
-err:	__wt_spin_unlock(session, &conn->reconfig_lock);
+err:	if (locked)
+		__wt_spin_unlock(session, &conn->reconfig_lock);
 
 	API_END_RET(session, ret);
 }
@@ -1117,11 +1121,11 @@ __conn_open_session(WT_CONNECTION *wt_conn,
 	*wt_sessionp = NULL;
 
 	conn = (WT_CONNECTION_IMPL *)wt_conn;
-	session_ret = NULL;
 
 	CONNECTION_API_CALL(conn, session, open_session, config, cfg);
 	WT_UNUSED(cfg);
 
+	session_ret = NULL;
 	WT_ERR(__wt_open_session(
 	    conn, event_handler, config, true, &session_ret));
 	*wt_sessionp = &session_ret->iface;
diff --git a/src/third_party/wiredtiger/src/evict/evict_lru.c b/src/third_party/wiredtiger/src/evict/evict_lru.c
index 35c057c9767..acc81f566a5 100644
--- a/src/third_party/wiredtiger/src/evict/evict_lru.c
+++ b/src/third_party/wiredtiger/src/evict/evict_lru.c
@@ -152,12 +152,24 @@ __wt_evict_list_clear_page(WT_SESSION_IMPL *session, WT_REF *ref)
 /*
  * __evict_queue_empty --
  *	Is the queue empty?
+ *
+ *	Note that the eviction server is pessimistic and treats a half full
+ *	queue as empty.
  */
 static inline bool
-__evict_queue_empty(WT_EVICT_QUEUE *queue)
+__evict_queue_empty(WT_EVICT_QUEUE *queue, bool server_check)
 {
-	return (queue->evict_current == NULL ||
-	    queue->evict_candidates == 0);
+	uint32_t candidates, used;
+
+	if (queue->evict_current == NULL)
+		return (true);
+
+	/* The eviction server only considers half of the candidates. */
+	candidates = queue->evict_candidates;
+	if (server_check && candidates > 1)
+		candidates /= 2;
+	used = (uint32_t)(queue->evict_current - queue->evict_queue);
+	return (used >= candidates);
 }
 
 /*
@@ -431,7 +443,6 @@ __evict_update_work(WT_SESSION_IMPL *session)
 {
 	WT_CACHE *cache;
 	WT_CONNECTION_IMPL *conn;
-	double dirty_trigger;
 	uint64_t bytes_inuse, bytes_max, dirty_inuse;
 
 	conn = S2C(session);
@@ -443,7 +454,7 @@ __evict_update_work(WT_SESSION_IMPL *session)
 	if (!F_ISSET(conn, WT_CONN_EVICTION_RUN))
 		return (false);
 
-	if (!__evict_queue_empty(cache->evict_urgent_queue))
+	if (!__evict_queue_empty(cache->evict_urgent_queue, false))
 		F_SET(cache, WT_CACHE_EVICT_URGENT);
 
 	/*
@@ -456,16 +467,14 @@ __evict_update_work(WT_SESSION_IMPL *session)
 	bytes_inuse = __wt_cache_bytes_inuse(cache);
 	if (bytes_inuse > (cache->eviction_target * bytes_max) / 100)
 		F_SET(cache, WT_CACHE_EVICT_CLEAN);
-	if (bytes_inuse > (cache->eviction_trigger * bytes_max) / 100)
-		F_SET(cache, WT_CACHE_EVICT_CLEAN_HARD);
+	if (__wt_eviction_clean_needed(session, NULL))
+		F_SET(cache, WT_CACHE_EVICT_CLEAN | WT_CACHE_EVICT_CLEAN_HARD);
 
 	dirty_inuse = __wt_cache_dirty_leaf_inuse(cache);
 	if (dirty_inuse > (cache->eviction_dirty_target * bytes_max) / 100)
 		F_SET(cache, WT_CACHE_EVICT_DIRTY);
-	if ((dirty_trigger = cache->eviction_scrub_limit) < 1.0)
-		dirty_trigger = (double)cache->eviction_dirty_trigger;
-	if (dirty_inuse > (uint64_t)(dirty_trigger * bytes_max) / 100)
-		F_SET(cache, WT_CACHE_EVICT_DIRTY_HARD);
+	if (__wt_eviction_dirty_needed(session, NULL))
+		F_SET(cache, WT_CACHE_EVICT_DIRTY | WT_CACHE_EVICT_DIRTY_HARD);
 
 	/*
 	 * If application threads are blocked by the total volume of data in
@@ -497,6 +506,12 @@ __evict_update_work(WT_SESSION_IMPL *session)
 		F_CLR(cache, WT_CACHE_EVICT_CLEAN | WT_CACHE_EVICT_CLEAN_HARD);
 	}
 
+	/* If threads are blocked by eviction we should be looking for pages. */
+	WT_ASSERT(session, !F_ISSET(cache, WT_CACHE_EVICT_CLEAN_HARD) ||
+	    F_ISSET(cache, WT_CACHE_EVICT_CLEAN));
+	WT_ASSERT(session, !F_ISSET(cache, WT_CACHE_EVICT_DIRTY_HARD) ||
+	    F_ISSET(cache, WT_CACHE_EVICT_DIRTY));
+
 	WT_STAT_CONN_SET(session, cache_eviction_state,
 	    F_MASK(cache, WT_CACHE_EVICT_MASK));
 
@@ -585,7 +600,7 @@ __evict_pass(WT_SESSION_IMPL *session)
 		 */
 		if (cache->evict_empty_score < WT_EVICT_SCORE_CUTOFF ||
 		    (!WT_EVICT_HAS_WORKERS(session) &&
-		    !__evict_queue_empty(cache->evict_urgent_queue)))
+		    !__evict_queue_empty(cache->evict_urgent_queue, false)))
 			WT_RET(__evict_lru_pages(session, true));
 
 		if (cache->pass_intr != 0)
@@ -921,7 +936,7 @@ __evict_lru_walk(WT_SESSION_IMPL *session)
 	 * If the queue we are filling is empty, pages are being requested
 	 * faster than they are being queued.
 	 */
-	if (__evict_queue_empty(queue)) {
+	if (__evict_queue_empty(queue, false)) {
 		if (F_ISSET(cache,
 		    WT_CACHE_EVICT_CLEAN_HARD | WT_CACHE_EVICT_DIRTY_HARD)) {
 			cache->evict_empty_score = WT_MIN(
@@ -1530,7 +1545,7 @@ __evict_get_ref(
 	WT_CACHE *cache;
 	WT_DECL_RET;
 	WT_EVICT_ENTRY *evict;
-	WT_EVICT_QUEUE *other_queue, *queue, *urgent_queue;
+	WT_EVICT_QUEUE *queue, *other_queue, *urgent_queue;
 	uint32_t candidates;
 	bool is_app, urgent_ok;
 
@@ -1546,9 +1561,9 @@ __evict_get_ref(
 	WT_STAT_CONN_INCR(session, cache_eviction_get_ref);
 
 	/* Avoid the LRU lock if no pages are available. */
-	if (__evict_queue_empty(cache->evict_current_queue) &&
-	    __evict_queue_empty(cache->evict_other_queue) &&
-	    __evict_queue_empty(urgent_queue)) {
+	if (__evict_queue_empty(cache->evict_current_queue, is_server) &&
+	    __evict_queue_empty(cache->evict_other_queue, is_server) &&
+	    (!urgent_ok || __evict_queue_empty(urgent_queue, false))) {
 		WT_STAT_CONN_INCR(session, cache_eviction_get_ref_empty);
 		return (WT_NOTFOUND);
 	}
@@ -1562,54 +1577,51 @@ __evict_get_ref(
 	 * Such cases are extremely rare in real applications.
 	 */
 	if (is_server &&
-	    (cache->evict_empty_score > WT_EVICT_SCORE_CUTOFF  ||
-	    __evict_queue_empty(cache->evict_fill_queue))) {
-		do {
+	    (cache->evict_empty_score > WT_EVICT_SCORE_CUTOFF ||
+	    __evict_queue_empty(cache->evict_fill_queue, false))) {
+		while ((ret = __wt_spin_trylock(
+		    session, &cache->evict_queue_lock)) == EBUSY)
 			if ((!urgent_ok ||
-			    __evict_queue_empty(urgent_queue)) &&
+			    __evict_queue_empty(urgent_queue, false)) &&
 			    !__evict_queue_full(cache->evict_fill_queue))
 				return (WT_NOTFOUND);
-		} while ((ret = __wt_spin_trylock(
-		    session, &cache->evict_queue_lock)) == EBUSY);
 
 		WT_RET(ret);
 	} else
 		__wt_spin_lock(session, &cache->evict_queue_lock);
 
-	/*
-	 * Check if the current queue needs to change.
-	 * The current queue could have changed while we waited for the lock.
-	 */
-	queue = cache->evict_current_queue;
-	other_queue = cache->evict_other_queue;
-	if (__evict_queue_empty(queue) && !__evict_queue_empty(other_queue)) {
-		cache->evict_current_queue = other_queue;
-		cache->evict_other_queue = queue;
-	}
-
 	/* Check the urgent queue first. */
-	queue = urgent_ok && !__evict_queue_empty(urgent_queue) ?
-	    urgent_queue : cache->evict_current_queue;
+	if (urgent_ok && !__evict_queue_empty(urgent_queue, false))
+		queue = urgent_queue;
+	else {
+		/*
+		 * Check if the current queue needs to change.
+		 * The current queue could have changed while we waited for
+		 * the lock.
+		 *
+		 * The server will only evict half of the pages before looking
+		 * for more. The remainder are left to eviction workers (if any
+		 * configured), or application threads if necessary.
+		 */
+		queue = cache->evict_current_queue;
+		other_queue = cache->evict_other_queue;
+		if (__evict_queue_empty(queue, is_server) &&
+		    !__evict_queue_empty(other_queue, is_server)) {
+			cache->evict_current_queue = other_queue;
+			cache->evict_other_queue = queue;
+		}
+	}
 
 	__wt_spin_unlock(session, &cache->evict_queue_lock);
 
 	/*
-	 * Only evict half of the pages before looking for more. The remainder
-	 * are left to eviction workers (if configured), or application threads
-	 * if necessary.
-	 */
-	candidates = queue->evict_candidates;
-	if (is_server && queue != urgent_queue && candidates > 1)
-		candidates /= 2;
-
-	/*
 	 * We got the queue lock, which should be fast, and chose a queue.
 	 * Now we want to get the lock on the individual queue.
 	 */
 	for (;;) {
 		/* Verify there are still pages available. */
-		if (__evict_queue_empty(queue) || (uint32_t)
-		    (queue->evict_current - queue->evict_queue) >= candidates) {
+		if (__evict_queue_empty(
+		    queue, is_server && queue != urgent_queue)) {
 			WT_STAT_CONN_INCR(
 			    session, cache_eviction_get_ref_empty2);
 			return (WT_NOTFOUND);
@@ -1621,6 +1633,15 @@ __evict_get_ref(
 		break;
 	}
 
+	/*
+	 * Only evict half of the pages before looking for more. The remainder
+	 * are left to eviction workers (if configured), or application thread
+	 * if necessary.
+	 */
+	candidates = queue->evict_candidates;
+	if (is_server && queue != urgent_queue && candidates > 1)
+		candidates /= 2;
+
 	/* Get the next page queued for eviction. */
 	for (evict = queue->evict_current;
 	    evict >= queue->evict_queue &&
@@ -1676,8 +1697,8 @@ __evict_get_ref(
 	}
 
 	/* Move to the next item. */
-	if (evict != NULL && evict + 1 <
-	    queue->evict_queue + queue->evict_candidates)
+	if (evict != NULL &&
+	    evict + 1 < queue->evict_queue + queue->evict_candidates)
 		queue->evict_current = evict + 1;
 	else /* Clear the current pointer if there are no more candidates. */
 		queue->evict_current = NULL;
@@ -1771,22 +1792,9 @@ __wt_cache_eviction_worker(WT_SESSION_IMPL *session, bool busy, u_int pct_full)
 	/* Wake the eviction server if we need to do work. */
 	__wt_evict_server_wake(session);
 
-	/*
-	 * If we're busy, either because of the transaction check we just did,
-	 * or because our caller is waiting on a longer-than-usual event (such
-	 * as a page read), limit the work to a single eviction and return. If
-	 * that's not the case, we can do more.
-	 */
 	init_evict_count = cache->pages_evict;
 
 	for (;;) {
-		/* Check if we have become busy. */
-		if (!busy && txn_state->snap_min != WT_TXN_NONE &&
-		    txn_global->current != txn_global->oldest_id)
-			busy = true;
-
-		max_pages_evicted = busy ? 5 : 20;
-
 		/*
 		 * A pathological case: if we're the oldest transaction in the
 		 * system and the eviction server is stuck trying to find space,
@@ -1799,6 +1807,20 @@ __wt_cache_eviction_worker(WT_SESSION_IMPL *session, bool busy, u_int pct_full)
 			return (WT_ROLLBACK);
 		}
 
+		/*
+		 * Check if we have become busy.
+		 *
+		 * If we're busy (because of the transaction check we just did
+		 * or because our caller is waiting on a longer-than-usual event
+		 * such as a page read), and the cache level drops below 100%,
+		 * limit the work to 5 evictions and return. If that's not the
+		 * case, we can do more.
+		 */
+		if (!busy && txn_state->snap_min != WT_TXN_NONE &&
+		    txn_global->current != txn_global->oldest_id)
+			busy = true;
+		max_pages_evicted = busy ? 5 : 20;
+
 		/* See if eviction is still needed. */
 		if (!__wt_eviction_needed(session, busy, &pct_full) ||
 		    (pct_full < 100 &&
@@ -1869,7 +1891,7 @@ __wt_page_evict_urgent(WT_SESSION_IMPL *session, WT_REF *ref)
 		goto done;
 
 	__wt_spin_lock(session, &urgent_queue->evict_lock);
-	if (__evict_queue_empty(urgent_queue)) {
+	if (__evict_queue_empty(urgent_queue, false)) {
 		urgent_queue->evict_current = urgent_queue->evict_queue;
 		urgent_queue->evict_candidates = 0;
 	}
diff --git a/src/third_party/wiredtiger/src/include/btree.i b/src/third_party/wiredtiger/src/include/btree.i
index 6e32c1bc195..a9ce4f754a9 100644
--- a/src/third_party/wiredtiger/src/include/btree.i
+++ b/src/third_party/wiredtiger/src/include/btree.i
@@ -406,7 +406,7 @@ __wt_cache_page_evict(WT_SESSION_IMPL *session, WT_PAGE *page)
 
 	/* Update pages and bytes evicted. */
 	(void)__wt_atomic_add64(&cache->bytes_evict, page->memory_footprint);
-	(void)__wt_atomic_add64(&cache->pages_evict, 1);
+	(void)__wt_atomic_addv64(&cache->pages_evict, 1);
 }
 
 /*
diff --git a/src/third_party/wiredtiger/src/include/cache.h b/src/third_party/wiredtiger/src/include/cache.h
index 515135f26ab..b24b625aec4 100644
--- a/src/third_party/wiredtiger/src/include/cache.h
+++ b/src/third_party/wiredtiger/src/include/cache.h
@@ -66,7 +66,7 @@ struct __wt_cache {
 	uint64_t bytes_dirty_leaf;
 	uint64_t pages_dirty_leaf;
 	uint64_t bytes_evict;		/* Bytes/pages discarded by eviction */
-	uint64_t pages_evict;
+	volatile uint64_t pages_evict;
 	uint64_t pages_evicted;		/* Pages evicted during a pass */
 	uint64_t bytes_image;		/* Bytes of disk images */
 	uint64_t bytes_inmem;		/* Bytes/pages in memory */
@@ -175,7 +175,7 @@ struct __wt_cache {
 #define	WT_CACHE_EVICT_CLEAN_HARD 0x002 /* Clean % blocking app threads */
 #define	WT_CACHE_EVICT_DIRTY	  0x004 /* Evict dirty pages */
 #define	WT_CACHE_EVICT_DIRTY_HARD 0x008 /* Dirty % blocking app threads */
-#define	WT_CACHE_EVICT_SCRUB	  0x010 /* Scrub dirty pages pages */
+#define	WT_CACHE_EVICT_SCRUB	  0x010 /* Scrub dirty pages */
 #define	WT_CACHE_EVICT_URGENT	  0x020 /* Pages are in the urgent queue */
 #define	WT_CACHE_EVICT_ALL	(WT_CACHE_EVICT_CLEAN | WT_CACHE_EVICT_DIRTY)
 #define	WT_CACHE_EVICT_MASK	  0x0FF
diff --git a/src/third_party/wiredtiger/src/include/cache.i b/src/third_party/wiredtiger/src/include/cache.i
index b5605769f1a..4255d04ec37 100644
--- a/src/third_party/wiredtiger/src/include/cache.i
+++ b/src/third_party/wiredtiger/src/include/cache.i
@@ -193,7 +193,7 @@ __wt_cache_bytes_other(WT_CACHE *cache)
  * __wt_session_can_wait --
  *	Return if a session available for a potentially slow operation.
  */
-static inline int
+static inline bool
 __wt_session_can_wait(WT_SESSION_IMPL *session)
 {
 	/*
@@ -202,17 +202,71 @@ __wt_session_can_wait(WT_SESSION_IMPL *session)
 	 * the system cache.
 	 */
 	if (!F_ISSET(session, WT_SESSION_CAN_WAIT))
-		return (0);
+		return (false);
 
 	/*
 	 * LSM sets the no-eviction flag when holding the LSM tree lock, in that
 	 * case, or when holding the schema lock, we don't want to highjack the
 	 * thread for eviction.
 	 */
-	if (F_ISSET(session, WT_SESSION_NO_EVICTION | WT_SESSION_LOCKED_SCHEMA))
-		return (0);
+	return (!F_ISSET(
+	    session, WT_SESSION_NO_EVICTION | WT_SESSION_LOCKED_SCHEMA));
+}
+
+/*
+ * __wt_eviction_clean_needed --
+ *	Return if an application thread should do eviction due to the total
+ *	volume of dirty data in cache.
+ */
+static inline bool
+__wt_eviction_clean_needed(WT_SESSION_IMPL *session, u_int *pct_fullp)
+{
+	WT_CACHE *cache;
+	uint64_t bytes_inuse, bytes_max;
+
+	cache = S2C(session)->cache;
+
+	/*
+	 * Avoid division by zero if the cache size has not yet been set in a
+	 * shared cache.
+	 */
+	bytes_max = S2C(session)->cache_size + 1;
+	bytes_inuse = __wt_cache_bytes_inuse(cache);
+
+	if (pct_fullp != NULL)
+		*pct_fullp = (u_int)((100 * bytes_inuse) / bytes_max);
+
+	return (bytes_inuse > (cache->eviction_trigger * bytes_max) / 100);
+}
+
+/*
+ * __wt_eviction_dirty_needed --
+ *	Return if an application thread should do eviction due to the total
+ *	volume of dirty data in cache.
+ */
+static inline bool
+__wt_eviction_dirty_needed(WT_SESSION_IMPL *session, u_int *pct_fullp)
+{
+	WT_CACHE *cache;
+	double dirty_trigger;
+	uint64_t dirty_inuse, bytes_max;
+
+	cache = S2C(session)->cache;
+
+	/*
+	 * Avoid division by zero if the cache size has not yet been set in a
+	 * shared cache.
+	 */
+	bytes_max = S2C(session)->cache_size + 1;
+	dirty_inuse = __wt_cache_dirty_leaf_inuse(cache);
+
+	if (pct_fullp != NULL)
+		*pct_fullp = (u_int)((100 * dirty_inuse) / bytes_max);
+
+	if ((dirty_trigger = cache->eviction_scrub_limit) < 1.0)
+		dirty_trigger = (double)cache->eviction_dirty_trigger;
 
-	return (1);
+	return (dirty_inuse > (uint64_t)(dirty_trigger * bytes_max) / 100);
 }
 
 /*
@@ -223,42 +277,30 @@ __wt_session_can_wait(WT_SESSION_IMPL *session)
 static inline bool
 __wt_eviction_needed(WT_SESSION_IMPL *session, bool busy, u_int *pct_fullp)
 {
-	WT_CONNECTION_IMPL *conn;
 	WT_CACHE *cache;
-	double dirty_trigger;
-	uint64_t bytes_inuse, bytes_max, dirty_inuse;
 	u_int pct_dirty, pct_full;
+	bool clean_needed, dirty_needed;
 
-	conn = S2C(session);
-	cache = conn->cache;
+	cache = S2C(session)->cache;
 
 	/*
 	 * If the connection is closing we do not need eviction from an
 	 * application thread.  The eviction subsystem is already closed.
 	 */
-	if (F_ISSET(conn, WT_CONN_CLOSING))
+	if (F_ISSET(S2C(session), WT_CONN_CLOSING))
 		return (false);
 
-	/*
-	 * Avoid division by zero if the cache size has not yet been set in a
-	 * shared cache.
-	 */
-	bytes_max = conn->cache_size + 1;
-	bytes_inuse = __wt_cache_bytes_inuse(cache);
-	dirty_inuse = __wt_cache_dirty_leaf_inuse(cache);
+	clean_needed = __wt_eviction_clean_needed(session, &pct_full);
+	dirty_needed = __wt_eviction_dirty_needed(session, &pct_dirty);
 
 	/*
 	 * Calculate the cache full percentage; anything over the trigger means
 	 * we involve the application thread.
 	 */
-	if (pct_fullp != NULL) {
-		pct_full = (u_int)((100 * bytes_inuse) / bytes_max);
-		pct_dirty = (u_int)((100 * dirty_inuse) / bytes_max);
-
+	if (pct_fullp != NULL)
 		*pct_fullp = (u_int)WT_MAX(0, 100 - WT_MIN(
 		    (int)cache->eviction_trigger - (int)pct_full,
 		    (int)cache->eviction_dirty_trigger - (int)pct_dirty));
-	}
 
 	/*
 	 * Only check the dirty trigger when the session is not busy.
@@ -268,11 +310,7 @@ __wt_eviction_needed(WT_SESSION_IMPL *session, bool busy, u_int *pct_fullp)
 	 * The next transaction in this session will not be able to start until
 	 * the cache is under the limit.
 	 */
-	if ((dirty_trigger = cache->eviction_scrub_limit) < 1.0)
-		dirty_trigger = (double)cache->eviction_dirty_trigger;
-	return (bytes_inuse > (cache->eviction_trigger * bytes_max) / 100 ||
-	    (!busy &&
-	    dirty_inuse > (uint64_t)(dirty_trigger * bytes_max) / 100));
+	return (clean_needed || (!busy && dirty_needed));
 }
 
 /*
diff --git a/src/third_party/wiredtiger/src/include/thread_group.h b/src/third_party/wiredtiger/src/include/thread_group.h
index f946dcab144..76758a090c4 100644
--- a/src/third_party/wiredtiger/src/include/thread_group.h
+++ b/src/third_party/wiredtiger/src/include/thread_group.h
@@ -14,7 +14,14 @@ struct __wt_thread {
 	WT_SESSION_IMPL *session;
 	u_int id;
 	wt_thread_t tid;
-#define	WT_THREAD_RUN		0x01
+
+	/*
+	 * WT_THREAD and thread-group function flags, merged because
+	 * WT_THREAD_PANIC_FAIL appears in both groups.
+	 */
+#define	WT_THREAD_CAN_WAIT	0x01	/* WT_SESSION_CAN_WAIT */
+#define	WT_THREAD_PANIC_FAIL	0x02	/* panic if the thread fails */
+#define	WT_THREAD_RUN		0x04	/* thread is running */
 	uint32_t flags;
 
 	/* The runner function used by all threads. */
@@ -22,12 +29,6 @@ struct __wt_thread {
 };
 
 /*
- * Flags for thread group functions.
- */
-#define	WT_THREAD_CAN_WAIT		0x01
-#define	WT_THREAD_PANIC_FAIL		0x02
-
-/*
  * WT_THREAD_GROUP --
  *	Encapsulation of a group of utility threads.
  */
diff --git a/src/third_party/wiredtiger/src/support/hazard.c b/src/third_party/wiredtiger/src/support/hazard.c
index 8ac8f5f9f6d..46b63ac6129 100644
--- a/src/third_party/wiredtiger/src/support/hazard.c
+++ b/src/third_party/wiredtiger/src/support/hazard.c
@@ -166,9 +166,10 @@ __wt_hazard_clear(WT_SESSION_IMPL *session, WT_PAGE *page)
 
 			/*
 			 * If this was the last hazard pointer in the session,
-			 * we may need to update our transactional context.
+			 * reset the size so that checks can skip this session.
 			 */
-			--session->nhazard;
+			if (--session->nhazard == 0)
+				WT_PUBLISH(session->hazard_size, 0);
 			return (0);
 		}
 
diff --git a/src/third_party/wiredtiger/src/txn/txn_ckpt.c b/src/third_party/wiredtiger/src/txn/txn_ckpt.c
index 180a06a3aed..3aad95f5a9f 100644
--- a/src/third_party/wiredtiger/src/txn/txn_ckpt.c
+++ b/src/third_party/wiredtiger/src/txn/txn_ckpt.c
@@ -423,7 +423,8 @@ __checkpoint_reduce_dirty_cache(WT_SESSION_IMPL *session)
 		 * level.
 		 */
 		__wt_sleep(0, 10 * stepdown_us);
-		cache->eviction_scrub_limit = current_dirty - delta;
+		cache->eviction_scrub_limit =
+		    WT_MAX(cache->eviction_dirty_target, current_dirty - delta);
 		WT_STAT_CONN_SET(session, txn_checkpoint_scrub_target,
 		    cache->eviction_scrub_limit);
 		WT_RET(__wt_epoch(session, &last));
diff --git a/src/third_party/wiredtiger/test/csuite/wt2719_reconfig/main.c b/src/third_party/wiredtiger/test/csuite/wt2719_reconfig/main.c
index 1ff7b10e1c6..b67dae6d647 100644
--- a/src/third_party/wiredtiger/test/csuite/wt2719_reconfig/main.c
+++ b/src/third_party/wiredtiger/test/csuite/wt2719_reconfig/main.c
@@ -27,6 +27,8 @@
  */
 #include "test_util.h"
 
+#include <signal.h>
+
 /*
  * JIRA ticket reference: WT-2719
  * Test case description: Fuzz testing for WiredTiger reconfiguration.
@@ -191,6 +193,41 @@ handle_message(WT_EVENT_HANDLER *handler,
 
 static WT_EVENT_HANDLER event_handler = { NULL, handle_message, NULL, NULL };
 
+static const char *current;			/* Current test configuration */
+
+static void on_alarm(int) WT_GCC_FUNC_DECL_ATTRIBUTE((noreturn));
+static void
+on_alarm(int signo)
+{
+	(void)signo;				/* Unused parameter */
+
+	fprintf(stderr, "configuration timed out: %s\n", current);
+	abort();
+
+	/* NOTREACHED */
+}
+
+static void
+reconfig(TEST_OPTS *opts, WT_SESSION *session, const char *config)
+{
+	int ret;
+
+	current = config;
+
+	/*
+	 * Reconfiguration starts and stops servers, so hangs are more likely
+	 * here than in other tests. Don't let the test run too long and get
+	 * a core dump when it happens.
+	 */
+	(void)alarm(60);
+	if ((ret = opts->conn->reconfigure(opts->conn, config)) != 0) {
+		fprintf(stderr, "%s: %s\n",
+		    config, session->strerror(session, ret));
+		exit (EXIT_FAILURE);
+	}
+	(void)alarm(0);
+}
+
 int
 main(int argc, char *argv[])
 {
@@ -200,7 +237,6 @@ main(int argc, char *argv[])
 	WT_SESSION *session;
 	size_t len;
 	u_int i, j;
-	int ret;
 	const char *p;
 	char *config;
 
@@ -226,13 +262,12 @@ main(int argc, char *argv[])
 	len = WT_ELEMENTS(list) * 64;
 	config = dmalloc(len);
 
+	/* Set an alarm so we can debug hangs. */
+	(void)signal(SIGALRM, on_alarm);
+
 	/* A linear pass through the list. */
 	for (i = 0; i < WT_ELEMENTS(list); ++i)
-		if ((ret = opts->conn->reconfigure(opts->conn, list[i])) != 0) {
-			fprintf(stderr, "%s: %s\n",
-			    list[i], session->strerror(session, ret));
-			return (EXIT_FAILURE);
-		}
+		reconfig(opts, session, list[i]);
 
 	/*
 	 * A linear pass through the list, adding random elements.
@@ -264,11 +299,7 @@ main(int argc, char *argv[])
 			}
 			strcat(config, p);
 		}
-		if ((ret = opts->conn->reconfigure(opts->conn, config)) != 0) {
-			fprintf(stderr, "%s: %s\n",
-			    config, session->strerror(session, ret));
-			return (EXIT_FAILURE);
-		}
+		reconfig(opts, session, config);
 	}
 
 	/*
diff --git a/src/third_party/wiredtiger/test/suite/test_compact01.py b/src/third_party/wiredtiger/test/suite/test_compact01.py
index 861e957d18d..8da1a0df4da 100644
--- a/src/third_party/wiredtiger/test/suite/test_compact01.py
+++ b/src/third_party/wiredtiger/test/suite/test_compact01.py
@@ -54,9 +54,11 @@ class test_compact(wttest.WiredTigerTestCase, suite_subprocess):
         ('utility', dict(utility=1,reopen=0)),
     ]
     scenarios = make_scenarios(types, compact)
-    # We want a large cache so that eviction doesn't happen
-    # (which could skew our compaction results).
-    conn_config = 'cache_size=250MB,statistics=(all)'
+
+    # Configure the connection so that eviction doesn't happen (which could
+    # skew our compaction results).
+    conn_config = 'cache_size=1GB,eviction_checkpoint_target=80,' +\
+        'eviction_dirty_target=80,eviction_dirty_trigger=95,statistics=(all)'
 
     # Test compaction.
     def test_compact(self):